如何在删除前检查文件是否存在？

问题描述：

我想创建一个脚本，如果我的文件存在然后执行删除，然后从artifactory得到wget。下面这段代码运行出于某种原因不会删除我的文件，并创建一个新的扩展名...例如cageo.crt.1，.2，.3等如何在删除前检查文件是否存在？

当我尝试调试它会显示rm -f但没有文件名

#!/bin/bash -ex 
    #install Certificate 
    cd /deployment/scripts 

    # check if cert is already installed 
    file = cageo.crt 
    if [ -f $file ]; then 
      echo "File $file exists." 
      echo "Delete file and get latest" 
      rm -f $file 
      wget https://artifactory.geo.com/artifactory/cageo.crt 
    else 
      wget https://artifactory.geo.com/artifactory/cageo.crt 
    fi

这是我的输出：

+ cd /deployment/scripts 
+ file = cageo.crt 
=:    cannot open (No such file or directory) 
cageo.crt: PEM certificate 
+ '[' -f ']' 
+ echo 'File exists.' 
File exists. 
+ echo 'Delete file and get latest' 
Delete file and get latest 
+ rm -f 
+ wgethttps://artifactory.geo.com/artifactory/cageo.crt/cageo.crt 
--2017-10-19 17:39:16-- https://artifactory.geo.com/artifactory/cageo.crt/cageo.crt 
Resolving artifactory.geo.com (artifactory.geo.com)... 10.0.138.51 
Connecting to artifactory.geo.com (artifactory.geo.com)|10.0.138.51|:443... connected. 
HTTP request sent, awaiting response... 200 OK 
Length: 1675 (1.6K) [application/octet-stream] 
Saving to: ‘cageo.crt.4’

删除'file'，'='和'cageo.crt'之间的空间。它应该读取'file = cageo.crt' – iamauser

iamauser是正确的...还要确保你没有使用rm的别名。使用完全合格的路径...就像'/ bin/rm'。 –

您可以将wget命令移出if-then-else-fi块 –

答

壳分配变量时，取出的空间。它应该阅读，

file="cageo.crt"

然后用，

if [ -f "$file" ];

见这太问题：https://unix.stackexchange.com/questions/258727/spaces-in-variable-assignments-in-shell-scripts

如何在删除前检查文件是否存在？

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